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yaklang/injection-de-langage-d-expression

Playbook d'injection de langage d'expression. À utiliser lorsque des expressions Java EL, SpEL, OGNL ou MVEL peuvent évaluer une entrée contrôlée par un attaquant dans Spring, Struts2, Confluence ou des frameworks similaires.

Qu'est-ce que injection-de-langage-d-expression ?

Ce skill fournit un playbook d'injection de langage d'expression (Expression Language Injection), conçu pour identifier et exploiter les vulnérabilités où des expressions Java EL, SpEL, OGNL ou MVEL évaluent des entrées non fiables dans des frameworks comme Spring, Struts2 ou Confluence. Il guide l'agent à travers des techniques de détection, d'exploitation et de contournement de filtres, en utilisant des payloads spécifiques et des contextes d'exécution. Le skill est optimisé pour être utilisé avec l'outil yaklang, permettant une exécution automatisée de tests de sécurité. Sa valeur réside dans sa capacité à aider les développeurs et les testeurs de sécurité à valider rapidement la présence de ces vulnérabilités courantes mais dangereuses, et à comprendre comment les exploiter de manière contrôlée en environnement de test.

Compatible avec~Claude Code~Codex CLI~Cursor
npx skills add https://github.com/yaklang/hack-skills/tree/main/skills/expression-language-injection

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Documentation

Que fait injection-de-langage-d-expression ?

Playbook d'injection de langage d'expression. À utiliser lorsque des expressions Java EL, SpEL, OGNL ou MVEL peuvent évaluer une entrée contrôlée par un attaquant dans Spring, Struts2, Confluence ou des frameworks similaires.

Vue d'ensemble

Ce playbook fournit une méthodologie standardisée pour tester et exploiter les vulnérabilités d'injection de langage d'expression. Il couvre les étapes suivantes :

  1. Identification : Détection des points d'entrée potentiels où les expressions sont évaluées.
  2. Fuzzing : Envoi de payloads de base pour confirmer la vulnérabilité.
  3. Exploitation : Construction de payloads avancés pour exécuter des commandes, lire des fichiers, ou effectuer des actions arbitraires.
  4. Contournement : Techniques pour bypasser les filtres de sécurité courants.

Utilisation

Prérequis

  • yaklang installé sur votre système.
  • Accès à l'application cible à des fins de test autorisé.

Exécution

yak run injection-EL

Exemples de payloads

SpEL (Spring Expression Language)

${7*7}
#{7*7}
${T(java.lang.Runtime).getRuntime().exec('id')}

OGNL (Object-Graph Navigation Language)

${7*7}
#{"mult"+"iply"}

EL (Expression Language)

${7*7}
${request.getAttribute("org.apache.catalina.jsp_file")}

Ressources

Licence

Ce playbook est distribué sous licence MIT. Voir le fichier LICENSE pour plus de détails.

Individual skills in this repo

This repo contains 20 individual skills — each has its own dedicated page.

yaklang/401-403-bypass-techniques

401/403 bypass playbook. Use when encountering access-denied responses on admin panels, API endpoints, or restricted paths. Covers path manipulation, HTTP method tampering, header injection, protocol downgrade, and automated bypass tools.

yaklang/active-directory-acl-abuse

Active Directory ACL abuse playbook. Use when exploiting misconfigured AD permissions including GenericAll, WriteDACL, DCSync rights, shadow credentials, LAPS reading, GPO abuse, and BloodHound-guided attack paths.

yaklang/active-directory-certificate-services

AD Certificate Services attack playbook. Use when targeting misconfigured AD CS for privilege escalation via ESC1-ESC13 template abuse, NTLM relay to enrollment, CA officer abuse, and certificate-based persistence.

yaklang/active-directory-kerberos-attacks

Kerberos attack playbook for Active Directory. Use when targeting AD authentication via AS-REP roasting, Kerberoasting, golden/silver/diamond tickets, delegation abuse, or pass-the-ticket attacks.

yaklang/ai-ml-security

AI/ML security playbook. Use when assessing model supply chain attacks (pickle RCE, poisoned weights), adversarial examples, model poisoning, model stealing, data privacy attacks (membership inference, model inversion), and autonomous agent security risks.

yaklang/android-pentesting-tricks

Android pentesting playbook. Use when testing Android applications for SSL pinning bypass, exported component abuse, WebView vulnerabilities, intent redirection, root detection bypass, tapjacking, and backup extraction during authorized mobile security assessments.

yaklang/anti-debugging-techniques

Anti-debugging detection and bypass playbook. Use when reversing protected binaries that detect debuggers via ptrace, PEB flags, timing checks, or signal/exception handlers on Linux and Windows.

yaklang/api-auth-and-jwt-abuse

API authentication and JWT abuse playbook. Use when testing bearer tokens, API keys, claim trust, header spoofing, rate limits, and API auth boundary weaknesses.

yaklang/api-authorization-and-bola

API authorization and BOLA testing playbook. Use when APIs expose object identifiers, nested resources, hidden writable fields, or weak function-level authorization.

yaklang/api-recon-and-docs

API reconnaissance and documentation review playbook. Use when discovering endpoints, schemas, versions, OpenAPI specs, hidden docs, and surface area for API testing.

yaklang/api-sec

Entry P1 category router for API security. Use when choosing between API recon, authorization, token abuse, and hidden-parameter workflows before any deeper API topic skill.

yaklang/arbitrary-write-to-rce

Arbitrary write to RCE playbook. Use when you have an arbitrary write primitive (from heap exploitation, format string, or OOB write) and need to convert it into code execution by targeting GOT, hooks, _IO_FILE vtable, exit_funcs, TLS_dtor_list, modprobe_path, .fini_array, or C++ vtables.

yaklang/authbypass-authentication-flaws

Authentication bypass testing playbook. Use when assessing login flows, password reset logic, account recovery, MFA bypass, token predictability, brute-force resistance, and session boundary flaws.

yaklang/auth-sec

Entry P1 category router for authentication and authorization. Use when testing login flows, sessions, object authorization, JWT, OAuth, CORS, CSRF, and enterprise SSO weaknesses before any deeper auth topic skill.

yaklang/binary-protection-bypass

Binary protection bypass playbook. Use when identifying and bypassing ASLR, PIE, NX/DEP, stack canary, RELRO, FORTIFY_SOURCE, CET, and MTE protections in ELF binaries to enable exploitation.

yaklang/browser-exploitation-v8

Browser and V8 exploitation playbook. Use when exploiting JavaScript engine vulnerabilities including JIT type confusion, incorrect bounds elimination, and V8 sandbox bypass to achieve renderer RCE and sandbox escape in Chrome/Chromium.

yaklang/business-logic-vuln

Entry P1 category router for business logic testing. Use when workflow abuse, race conditions, pricing flaws, or multi-step state attacks matter more than parser-level input injection.

yaklang/business-logic-vulnerabilities

Business logic vulnerability playbook. Use when reasoning about workflows, race conditions, price manipulation, coupon abuse, state machines, and multi-step authorization gaps.

yaklang/classical-cipher-analysis

Classical cipher analysis playbook. Use when encountering substitution ciphers, Vigenere, transposition, XOR, or encoded text in CTF challenges that requires frequency analysis, Kasiski examination, or known-plaintext cryptanalysis.

yaklang/clickjacking

Clickjacking playbook. Use when testing whether target pages can be framed, whether X-Frame-Options or CSP frame-ancestors are properly configured, and whether UI redress attacks can trigger sensitive actions.

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